CN107442550A - The recycling method of neodymium iron boron waste material after plating - Google Patents
The recycling method of neodymium iron boron waste material after plating Download PDFInfo
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- CN107442550A CN107442550A CN201710537582.0A CN201710537582A CN107442550A CN 107442550 A CN107442550 A CN 107442550A CN 201710537582 A CN201710537582 A CN 201710537582A CN 107442550 A CN107442550 A CN 107442550A
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- iron boron
- neodymium iron
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09B—DISPOSAL OF SOLID WASTE
- B09B3/00—Destroying solid waste or transforming solid waste into something useful or harmless
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09B—DISPOSAL OF SOLID WASTE
- B09B5/00—Operations not covered by a single other subclass or by a single other group in this subclass
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
- H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
- H01F1/03—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity
- H01F1/032—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of hard-magnetic materials
- H01F1/04—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of hard-magnetic materials metals or alloys
- H01F1/047—Alloys characterised by their composition
- H01F1/053—Alloys characterised by their composition containing rare earth metals
- H01F1/055—Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5
- H01F1/057—Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5 and IIIa elements, e.g. Nd2Fe14B
- H01F1/0571—Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5 and IIIa elements, e.g. Nd2Fe14B in the form of particles, e.g. rapid quenched powders or ribbon flakes
- H01F1/0575—Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5 and IIIa elements, e.g. Nd2Fe14B in the form of particles, e.g. rapid quenched powders or ribbon flakes pressed, sintered or bonded together
- H01F1/0577—Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5 and IIIa elements, e.g. Nd2Fe14B in the form of particles, e.g. rapid quenched powders or ribbon flakes pressed, sintered or bonded together sintered
Abstract
The present invention provides a kind of recycling method of the neodymium iron boron waste material after plating, and it comprises the following steps：Powder is crushed during neodymium iron boron waste material after plating is made, and powder will be crushed in this and carries out crushing powder during the processing of sieving separating coating is made after separation coating；The obtained neodymium iron boron mixed powder of airflow milling processing is carried out after powder mix with flour in sintered NdFeB by crushing in after the separation coating, and addition lubricant is mixed to prepare mixing fine powders again in the neodymium iron boron mixed powder；Neodymium iron boron magnetic body is made in the mixing fine powders.According to the neodymium iron boron waste material after plating provided by the invention recycling method prepare Sintered NdFeB magnet magnetic property it is qualified, not only environmental protection but also effectively reduce cost, improve the value of waste material.
Description
Technical field
The invention belongs to a kind of recycling of the neodymium iron boron waste material behind neodymium iron boron magnetic body field, more particularly to plating
Method.
Background technology
The magnetic energy product of NdFeB magnets is 240~400KJ/m3, is referred to as " magnetic king ", is the magnetic property highest being currently known
Permanent-magnet material.With the development of computer, intelligent appliance, Aero-Space, rare earth permanent magnet particularly Nd-Fe-B permanent magnetic industry obtains
To being widely applied.In NdFeB magnets main component be Fe (mass fraction about 65%), B (mass fraction about 1%) and
(Pr, Nd, Dy, Tb etc., total mass fraction is about 33%) by rare earth metal Re.Neodymium iron boron magnetic body is produced using powder metallurgical technique, material
Material is internal to have micro-pore and cavity, easily corrodes and aoxidizes in the case where the evils such as high temperature, humidity omit environment, accumulate over a long period easy shadow
The service life of magnet is rung, so using preceding having to pass through strict preservative treatment.
Neodymium iron boron preservative treatment at present generally uses the methods of plating, chemical plating, electrophoresis, spraying, phosphorating treatment, but electroplates
During due to material matrix corrosion-vulnerable, it is strict to treatment before plating requirement, high is required to plating solution acid-base value, material fragility is led greatly
The factors such as operation difficulty increase are caused, easily cause that poor adhesion, performance, outward appearance, plating thickness are unqualified, and waste material ratio is up to
10%~30%, waste extremely serious.One side rare earth resources belong to rare, expensive strategic resource, on the other hand both at home and abroad
The demand of rare earth is constantly increased every year.Therefore, how to reclaim and using neodymium iron boron plating wastes, reduce rare earth consumption and seem
It is particularly important.
For waste product after plating, part producer sells it as waste product, for extracting neodymium, praseodymium and other rare earths member
Element, this mode greatly reduce product margin profit well below normal magnet price.Plating, example are taken off using chemistry in most producers
As hydrochloric acid take off it is zinc-plated, hydrochloric acid add nitric acid take off nickel plating etc. remove coating, its degree of oxidation of this kind of waste material is not high, using chemical method pair
Its recovery easily causes environmental pollution.Chinese patent (notification number：CN201310039135 one kind) is disclosed to be given up with neodymium iron boron nickel plating
Neodymium iron boron nickel plating waste material is calcined by the neodymium iron boron magnetic body that material sintering forms, this method in sintering furnace, then by after roasting
Neodymium iron boron nickel plating waste material is put into melting in vacuum rapid hardening furnace, then by hydrogen is broken, airflow milling, with normal powder batch mixing, compacting, sinter
To neodymium iron boron magnetic body.This mode mixes in smelt stage, the bad control of ingot structure structure, must also increase after having handled
Homogenized process, further, since the problem of various, often occurs in the complicated component such as waste material, material head.
The content of the invention
The technical problem to be solved by the invention is to provide a kind of recycling side of the neodymium iron boron waste material after plating
Method, this kind of method can make full use of plating wastes, largely can be added in virgin material, and mix powder with flour in normal sintered NdFeB
The Sintered NdFeB magnet magnetic property prepared afterwards does not decline, and reaches the purpose of high efficiente callback.
The present invention provides a kind of recycling method of the neodymium iron boron waste material after plating, and it comprises the following steps：
Powder is crushed during neodymium iron boron waste material after plating is made, and powder will be crushed in this and carries out sieving separating coating processing system
Powder is crushed in must separating after coating；
To crush in after the separation coating carried out after powder mix with flour in sintered NdFeB airflow milling handle it is obtained
Neodymium iron boron mixed powder, and add lubricant in the neodymium iron boron mixed powder and be mixed to prepare mixing fine powders again；
Neodymium iron boron magnetic body is made in the mixing fine powders.
Preferably, in the recycling method of the neodymium iron boron waste material after described plating,
Include the coating element for accounting for its gross weight 0.01%~1% in neodymium iron boron waste material after the plating；
The coating element includes the one or more in nickel, zinc, potassium, sodium, silicon, manganese, phosphorus；
The plating is nickel, ambrose alloy nickel, color zinc etc..
Preferably, in the recycling method of the neodymium iron boron waste material after described plating,
Powder is crushed during neodymium iron boron waste material after plating is made, including the neodymium iron boron waste material after plating is slightly broken successively
Broken, the broken and middle break process of hydrogen；
Particle diameter≤10mm after the coarse crushing；
The broken technological parameter of the hydrogen is：0.08~0.15MPa of pressure of hydrogen is inhaled, inhales 2~3h of hydrogen time, desorption temperature
For 490~580 DEG C, 3~5h of dehydrogenation time；
The particle diameter of powder is 30~50 μm after being crushed in described.
Preferably, in the recycling method of the neodymium iron boron waste material after described plating, the sieving separating coating
Processing carry out under nitrogen protection, separate coating after in crush powder particle diameter≤45 μm.
Preferably, in the recycling method of the neodymium iron boron waste material after described plating,
The weight for separating the middle flour after coating is 1%~35% of the quality of flour in sintered NdFeB；
Incorporation time is 90~150min；
300~500ppm additive is added in mixed process, the additive is zinc stearate, calcium stearate and poly- second
One or more in glycol octane.
Preferably, in the recycling method of the neodymium iron boron waste material after described plating, the grinding of the airflow milling
Gas pressure is~0.45MPa, and the particle mean size of the neodymium iron boron mixed-powder is 2.6~3.5 μm.
Preferably, in the recycling method of the neodymium iron boron waste material after described plating,
The lubricant is methyl esters class, the one or more of alcohols；
The addition of the lubricant accounts for 1 ‰~the 3 ‰ of neodymium iron boron mixed-powder quality；
The incorporation time mixed again is 120~240min.
Preferably, in the recycling method of the neodymium iron boron waste material after described plating, by the mixing fine powders system
Obtaining neodymium iron boron magnetic body includes：Mixing fine powders are orientated to compacting in moulding press, after isostatic pressed, obtain neodymium iron boron pressed compact, will
Neodymium iron boron pressed compact cut it is loose after material pile up in expect in boat, shove charge is sintered, is tempered obtained neodymium iron boron magnetic body.
Preferably, in the recycling method of the neodymium iron boron waste material after described plating,
The magnetic field intensity of the orientation compacting is 1.2~1.8T, and the pressure of the isostatic pressed processing is 120~250MPa,
The green density is 3.6~3.8g/cm3.；
The sintering temperature is 1020~1100 DEG C, is incubated 3~8h, and argon gas is air-cooled to room temperature；
The tempered condition is air-cooled to room temperature in 460~580 DEG C of progress second annealings insulation 2~4h argon gas, obtains neodymium
Iron boron magnet；Or tempered condition is first carries out one-level tempering, 850~950 DEG C of insulation 2~5h argon gas are air-cooled, then reheat
Second annealing is carried out to 460~580 DEG C and is incubated 2~4h, and argon gas is air-cooled to room temperature, obtains neodymium iron boron magnetic body.
Compared with prior art, beneficial effects of the present invention are as follows：
(1) sieving separating plating process is used, the separative efficiency of coating and matrix can be greatly improved, removes the piece of coating
The impurity that shape thing and electroplating process are introduced, the magnetic powder particle prepared are uniform and impure less.
(2) waste material need not carry out melting after the inventive method processing plating, simplify the handling processes such as homogenization.
(3) the inventive method improves the value and profit of waste material relative to the method directly scrapped；
(4) waste material mixes with normal magnetic after electroplating, and under the premise of the performance of normal magnetic is not influenceed, can largely be added to
In virgin material, reach the purpose of high efficiente callback.
Further advantage, target and the feature of the present invention embodies part by following explanation, and part will also be by this
The research and practice of invention and be understood by the person skilled in the art.
Embodiment
The present invention is described in further detail below, to make those skilled in the art being capable of evidence with reference to specification word
To implement.
It should be appreciated that such as " having ", "comprising" and " comprising " term used herein do not allot one or more
The presence or addition of individual other elements or its combination.
Embodiment 1
The N series trade mark (total amount such as rare earth Pr, Nd 31.5%, without heavy rare earth such as Dy, Tb)
(1) waste material after N35, N38, N40, N42, N45, N48, N50 Sintered NdFeB magnet are electroplated carries out coarse crushing,
Particle diameter≤10mm after coarse crushing.
(2) it is the particulate material feeding hydrogen blasting furnace progress hydrogen after coarse crushing is quick-fried, hydrogen pressure 0.1MPa is inhaled, inhales hydrogen time 3h,
Dehydrogenation at a temperature of 580 DEG C, dehydrogenation time 5h.
(3) hydrogen is crushed during powder is carried out and crushes simultaneously sieving separating coating.The particle diameter of powder is 30~50 μm after being crushed in described,
Sieving process is carried out under nitrogen protection, particle diameter≤45 μm of powder after sieving separating coating.
(4) it is beautiful with imitating with flour in the normal N35 brands of sintered Nd-Fe-B of 1000kg that 300kg is separated to the middle flour after coating
The three-dimensional mixed powder machine of formula mixes powder, and it is 90min to mix the powder time, needs to add 300ppm zinc stearate additive during mixed powder.Afterwards
It is sent into airflow milling equipment and carries out airflow milling, obtains neodymium iron boron mixed-powder.The grinding gas pressure of airflow milling is 0.45MPa,
The particle mean size of neodymium iron boron mixed-powder is 3.28 μm.
(5) add 1 ‰ Jc1 lubricants in neodymium iron boron mixed-powder to be mixed again, incorporation time 150min.
(6) by mixing fine powders in nitrogen protection down in moulding press mould, it is compressing in 1.5T magnetic field, warp
After 220MPa pressure isostatic presseds, neodymium iron boron pressed compact, green density 3.61g/cm are obtained3。
(7) by neodymium iron boron pressed compact cut it is loose after material pile up in expecting in boat, be put into sintering furnace and burnt at a temperature of 1035 DEG C
Argon gas is air-cooled after knot 5 hours argon gas of insulation are air-cooled to room temperature, and tempering is incubated 3 hours at 540 DEG C, finally gives neodymium-iron-boron
Body.
Sintered NdFeB magnet prepared by the above method is processed into D10*10 sample, carries out performance detection, performance is shown in
Table 1.
Embodiment 2
The H series trade mark (total amount such as rare earth Pr, Nd 29%, without heavy rare earth such as Dy, Tb)
(1) waste material after 35H, 38H, 40H, 42H, 45H, 48H, 50H Sintered NdFeB magnet are electroplated carries out coarse crushing,
Particle diameter≤10mm after coarse crushing.
(2) it is the particulate material feeding hydrogen blasting furnace progress hydrogen after coarse crushing is quick-fried, hydrogen pressure 0.1MPa is inhaled, inhales hydrogen time 3h,
Dehydrogenation at a temperature of 580 DEG C, dehydrogenation time 5h.
(3) hydrogen is crushed during powder is carried out and crushes simultaneously sieving separating coating.The particle diameter of powder is 30~50 μm after being crushed in described,
Sieving process is carried out under nitrogen protection, particle diameter≤45 μm of powder after sieving separating coating.
(4) it is beautiful with imitating with flour in the normal 48H brands of sintered Nd-Fe-B of 1200kg that 180kg is separated to the middle flour after coating
The three-dimensional mixed powder machine of formula mixes powder, and it is 120min to mix the powder time, needs to add 300ppm zinc stearate additive during mixed powder.Afterwards
It is sent into airflow milling equipment and carries out airflow milling, obtains neodymium iron boron mixed-powder.The grinding gas pressure of airflow milling is 0.45MPa,
The particle mean size of neodymium iron boron mixed-powder is 3.12 μm.
(5) add 1.5 ‰ Jc1 lubricants in neodymium iron boron mixed-powder to be mixed again, incorporation time 180min.
(6) by mixing fine powders in nitrogen protection down in moulding press mould, it is compressing in 1.7T magnetic field, warp
After 220MPa pressure isostatic presseds, neodymium iron boron pressed compact, green density 3.63g/cm are obtained3。
(7) by neodymium iron boron pressed compact cut it is loose after material pile up in expecting in boat, be put into sintering furnace and burnt at a temperature of 1033 DEG C
Argon gas is air-cooled after knot 5 hours argon gas of insulation are air-cooled to room temperature, and tempering is incubated 3 hours at 520 DEG C, finally gives neodymium-iron-boron
Body.
Sintered NdFeB magnet prepared by the above method is processed into D10*10 sample, carries out performance detection, performance is shown in
Table 1.
Embodiment 3
The SH series trade mark (total amount such as rare earth Pr, Nd 28.5%, the total amount such as heavy rare earth Dy, Tb 0.5%~2.5%)
(1) waste material after 30SH, 35SH, 38SH, 40SH, 42SH, 45SH, 48SH Sintered NdFeB magnet are electroplated is carried out
Coarse crushing, particle diameter≤10mm after coarse crushing.
(2) it is the particulate material feeding hydrogen blasting furnace progress hydrogen after coarse crushing is quick-fried, hydrogen pressure 0.1MPa is inhaled, inhales hydrogen time 3h,
Dehydrogenation at a temperature of 580 DEG C, dehydrogenation time 5h.
(3) hydrogen is crushed during powder is carried out and crushes simultaneously sieving separating coating.The particle diameter of powder is 30~50 μm after being crushed in described,
Sieving process is carried out under nitrogen protection, particle diameter≤45 μm of powder after sieving separating coating.
(4) it is beautiful with imitating with flour in the normal 42SH brands of sintered Nd-Fe-B of 900kg that 90kg is separated to the middle flour after coating
The three-dimensional mixed powder machine of formula mixes powder, and it is 150min to mix the powder time, needs to add 350ppm zinc stearate additive during mixed powder.Afterwards
It is sent into airflow milling equipment and carries out airflow milling, obtains neodymium iron boron mixed-powder.The grinding gas pressure of airflow milling is 0.45MPa,
The particle mean size of neodymium iron boron mixed-powder is 2.98 μm.
(5) add 1.5 ‰ Jc1 lubricants in neodymium iron boron mixed-powder to be mixed again, incorporation time 180min.
(6) by mixing fine powders in nitrogen protection down in moulding press mould, it is compressing in 1.8T magnetic field, warp
After 220MPa pressure isostatic presseds, neodymium iron boron pressed compact, green density 3.65g/cm are obtained3。
(7) by neodymium iron boron pressed compact cut it is loose after material pile up in expecting in boat, be put into sintering furnace and burnt at a temperature of 1040 DEG C
Knot 5 hours argon gas of insulation are air-cooled to room temperature, will be air-cooled after blank carries out one-level tempering insulation cooling in 4.5 hours at 900 DEG C,
500 DEG C are warming up to again cool down after second annealing is incubated 3 hours, finally give neodymium iron boron magnetic body.
Sintered NdFeB magnet prepared by the above method is processed into D10*10 sample, carries out performance detection, performance is shown in
Table 1.
Comparative example 1
By flour in the normal N35 brands of sintered Nd-Fe-B of 600kg, (total amount such as rare earth Pr, Nd is 31.5%, dilute without weight
Soil) 300ppm zinc stearate additives are added, powder 90min is mixed with imitative American three-dimensional mixed powder machine, obtains mixed coarse powder.Afterwards in air-flow
Airflow milling is carried out in mill equipment, grinding gas pressure is 0.45MPa, and powder mean particle sizes are 3.24 μm.Magnetic after airflow milling
Add 1 ‰ Jc1 lubricants to be mixed again, incorporation time 150min.By the moulding press of gained fine powder under nitrogen protection
Middle orientation compacting, after isostatic pressed, obtains neodymium iron boron pressed compact.Neodymium iron boron pressed compact is cut into material fed to boiler, in 1035 DEG C of temperature
Argon gas is air-cooled after 5 hours argon gas of lower sintered heat insulating are air-cooled to room temperature, and tempering is incubated 3 hours at 540 DEG C, finally gives neodymium iron
Boron magnet.
Sintered NdFeB magnet prepared by the above method is processed into D10*10 sample, carries out performance detection, performance is shown in
Table 1.
Comparative example 2
Flour (total amount such as rare earth Pr, Nd 29%, without heavy rare earth) in the normal 48H brands of sintered Nd-Fe-B of 600kg is added
Enter 300ppm resin acid zinc additives, mix powder 120min with imitative American three-dimensional mixed powder machine, obtain mixed coarse powder.Afterwards in airflow milling equipment
Middle carry out airflow milling, grinding gas pressure are 0.45MPa, and powder mean particle sizes are 3.11 μm.Magnetic after airflow milling adds
1.5 ‰ Jc1 lubricants are mixed again, incorporation time 180min.By in the moulding press of gained fine powder under nitrogen protection
Orientation compacting, after isostatic pressed, obtains neodymium iron boron pressed compact.Neodymium iron boron pressed compact is cut into material fed to boiler, at a temperature of 1033 DEG C
Argon gas is air-cooled after 5 hours argon gas of sintered heat insulating are air-cooled to room temperature, and tempering is incubated 3 hours at 520 DEG C, finally gives neodymium iron boron
Magnet.
Sintered NdFeB magnet prepared by the above method is processed into D10*10 sample, carries out performance detection, performance is shown in
Table 1.
Comparative example 3
By flour in the normal 42SH brands of sintered Nd-Fe-B of 600kg (total amount such as rare earth Pr, Nd 28.5%, heavy rare earth Dy,
The total amounts such as Tb 0.5%~2.5%) 350ppm resin acid zinc additives are added, powder 150min is mixed with imitative American three-dimensional mixed powder machine, is obtained
Mixed coarse powder.Airflow milling is carried out in airflow milling equipment afterwards, grinding gas pressure is 0.45MPa, and powder mean particle sizes are 2.96 μ
m.Magnetic after airflow milling adds 1.5 ‰ Jc1 lubricants and mixed again, incorporation time 180min.By gained fine powder in nitrogen
Compacting is orientated in moulding press under gas shielded, after isostatic pressed, obtains neodymium iron boron pressed compact.Enter after neodymium iron boron pressed compact is cut into material
Stove, 5 hours argon gas of sintered heat insulating are air-cooled to room temperature at a temperature of 1040 DEG C, will be air-cooled after blank one is carried out at 900 DEG C
Level tempering insulation cools down for 4.5 hours, is warming up to 500 DEG C again and cooled down after second annealing is incubated 3 hours, finally gives neodymium iron
Boron magnet.
Sintered NdFeB magnet prepared by the above method is processed into D10*10 sample, carries out performance detection, performance is shown in
Table 1.
The embodiment 1~3 of table 1 and the gained sintered NdFeB blank magnetic property contrast table of comparative example 1~3
| Br(KGs) | Hcj(KOe) | (BH)m(MGOe) | Hk/Hcj | |
| Embodiment 1 | 12.71 | 14.61 | 38.28 | 0.955 |
| Comparative example 1 | 12.69 | 15.26 | 38.31 | 0.972 |
| Embodiment 2 | 13.24 | 17.63 | 42.87 | 0.980 |
| Comparative example 2 | 13.27 | 17.77 | 43.24 | 0.979 |
| Embodiment 3 | 12.85 | 23.78 | 40.23 | 0.983 |
| Comparative example 3 | 12.83 | 24.15 | 40.10 | 0.985 |
Contrasted in comparative example 1 using normal N35 grade neodymium-iron-borons magnetic, volume production magnetic energy range is Br： 12.44
~12.73KGs, Hcj：13.84~15.36KOe.Contrasted, measured using normal 48H grade neodymium-iron-borons magnetic in comparative example 2
It is Br to produce magnetic energy range：13.18~13.58KGs, Hcj：16.96~18.88KOe.Normal 42SH is used in comparative example 3
Grade neodymium-iron-boron magnetic contrasts, and volume production magnetic energy range is Br：12.77~13.03KGs, Hcj：22.04~24.24KOe.
From the embodiment 1~3 and comparative example 1~3 of table 1, neodymium iron boron waste material after plating is classified back using the inventive method
Receipts are used in mixed way with normal NdFeB magnetic powder, can be reached qualified properties of product, be improved the value and profit of waste material.
Although embodiment of the present invention is disclosed as above, it is not restricted in specification and embodiment listed
With it can be applied to various suitable the field of the invention completely, can be easily for those skilled in the art
Other modification is realized, therefore under the universal limited without departing substantially from claim and equivalency range, it is of the invention and unlimited
In specific details.
Claims (9)
1. the recycling method of the neodymium iron boron waste material after plating, it is characterised in that comprise the following steps：
Broken powder during neodymium iron boron waste material after plating is made, and powder progress sieving separating coating processing will be crushed in this and is made and is divided
From crushing powder in after coating；
It will crush in after the separation coating and airflow milling is carried out after powder mix with flour in sintered NdFeB handle obtained neodymium iron
Boron mixed powder, and add lubricant in the neodymium iron boron mixed powder and be mixed to prepare mixing fine powders again；
Neodymium iron boron magnetic body is made in the mixing fine powders.
2. the recycling method of the neodymium iron boron waste material after plating as claimed in claim 1, it is characterised in that
Include the coating element for accounting for its gross weight 0.01%~1% in neodymium iron boron waste material after the plating；
The coating element includes the one or more in nickel, zinc, potassium, sodium, silicon, manganese, phosphorus；
The plating is nickel, ambrose alloy nickel, color zinc etc..
3. the recycling method of the neodymium iron boron waste material after plating as claimed in claim 1, it is characterised in that
Powder is crushed during neodymium iron boron waste material after plating is made, including the neodymium iron boron waste material after plating carried out successively coarse crushing,
Hydrogen crushes and middle break process；
Particle diameter≤10mm after the coarse crushing；
The broken technological parameter of the hydrogen is：0.08~0.15MPa of pressure of hydrogen is inhaled, inhales 2~3h of hydrogen time, desorption temperature is
490~580 DEG C, 3~5h of dehydrogenation time；
The particle diameter of powder is 30~50 μm after being crushed in described.
4. the recycling method of the neodymium iron boron waste material after plating as claimed in claim 1, it is characterised in that the sieving
Separation coating processing carries out under nitrogen protection, separate coating after in crush powder particle diameter≤45 μm.
5. the recycling method of the neodymium iron boron waste material after plating as claimed in claim 1, it is characterised in that
The weight for separating the middle flour after coating is 1%~35% of the quality of flour in sintered NdFeB；
Incorporation time is 90~150min；
300~500ppm additive is added in mixed process, the additive is zinc stearate, calcium stearate and polyethylene glycol
One or more in octane.
6. the recycling method of the neodymium iron boron waste material after plating as claimed in claim 1, it is characterised in that the air-flow
The grinding gas pressure of mill is~0.45MPa, and the particle mean size of the neodymium iron boron mixed-powder is 2.6~3.5 μm.
7. the recycling method of the neodymium iron boron waste material after plating as claimed in claim 1, it is characterised in that
The lubricant is methyl esters class, the one or more of alcohols；
The addition of the lubricant accounts for 1 ‰~the 3 ‰ of neodymium iron boron mixed-powder quality；
The incorporation time mixed again is 120~240min.
8. the recycling method of the neodymium iron boron waste material after plating as claimed in claim 1, it is characterised in that will be described mixed
Closing the obtained neodymium iron boron magnetic body of fine powder includes：Mixing fine powders are orientated to compacting in moulding press, after isostatic pressed, obtain neodymium iron boron
Pressed compact, by neodymium iron boron pressed compact cut it is loose after material pile up in expect in boat, shove charge is sintered, is tempered obtained neodymium iron boron magnetic body.
9. the recycling method of the neodymium iron boron waste material after plating as claimed in claim 8, it is characterised in that
The magnetic field intensity of the orientation compacting is 1.2~1.8T, and the pressure of the isostatic pressed processing is 120~250MPa, described
Green density is 3.6~3.8g/cm3.；
The sintering temperature is 1020~1100 DEG C, is incubated 3~8h, and argon gas is air-cooled to room temperature；
The tempered condition is air-cooled to room temperature in 460~580 DEG C of progress second annealings insulation 2~4h argon gas, obtains neodymium iron boron
Magnet；Or tempered condition is first carries out one-level tempering, 850~950 DEG C of insulation 2~5h argon gas are air-cooled, then are reheated to 460
~580 DEG C carry out second annealing and are incubated 2~4h, and argon gas is air-cooled to room temperature, obtains neodymium iron boron magnetic body.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710537582.0A CN107442550A (en) | 2017-07-04 | 2017-07-04 | The recycling method of neodymium iron boron waste material after plating |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110090964A (en) * | 2018-01-28 | 2019-08-06 | 蒋盼盼 | A kind of method that the waste recovery of rare-earth Nd-Fe-B coating recycles |
| CN111292911A (en) * | 2020-01-13 | 2020-06-16 | 桂林电子科技大学 | Improved neodymium iron boron magnet material and improvement method thereof |
| CN114686746A (en) * | 2022-04-27 | 2022-07-01 | 江苏晨朗电子集团有限公司 | Recycling method of nickel-plated sintered neodymium iron boron waste material |
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| CN104439256A (en) * | 2014-11-24 | 2015-03-25 | 湖南航天磁电有限责任公司 | Method for recycling and reusing sintered Nd-Fe-B oxidation blank |
| CN104801717A (en) * | 2015-05-07 | 2015-07-29 | 安徽万磁电子有限公司 | Recycling technique for galvanized sintered NdFeB wastes |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104439256A (en) * | 2014-11-24 | 2015-03-25 | 湖南航天磁电有限责任公司 | Method for recycling and reusing sintered Nd-Fe-B oxidation blank |
| CN104801717A (en) * | 2015-05-07 | 2015-07-29 | 安徽万磁电子有限公司 | Recycling technique for galvanized sintered NdFeB wastes |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110090964A (en) * | 2018-01-28 | 2019-08-06 | 蒋盼盼 | A kind of method that the waste recovery of rare-earth Nd-Fe-B coating recycles |
| CN111292911A (en) * | 2020-01-13 | 2020-06-16 | 桂林电子科技大学 | Improved neodymium iron boron magnet material and improvement method thereof |
| CN111292911B (en) * | 2020-01-13 | 2021-09-14 | 桂林电子科技大学 | Improved neodymium iron boron magnet material and improvement method thereof |
| CN114686746A (en) * | 2022-04-27 | 2022-07-01 | 江苏晨朗电子集团有限公司 | Recycling method of nickel-plated sintered neodymium iron boron waste material |
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Application publication date: 20171208 |